Bundle Branch Block Determination - Complete Bundle Branch Block .
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Evidence of Bundle branch block (BBB) may be seen in any lead, but the best view for determining the difference between left and right BBB is lead V1.
Interruption, delay of conduction or a change in the electrical conduction pathway will cause morphologic changes in the QRS complex.
Among those changes seen will include a widening of the QRS complex measuring 0.12 seconds or greater and may include an alteration in the deflection of the ventricular depolarization.
Authors and ReviewersAuthored by Thomas O'Brien
Medically reviewed by Dr. Jonathan Keroes, MD, Cardiology
Last Update: 11/8/2020